Аннотация
Abstract Various precision observables, such as flavour changing decays, are loop induced in the standard model and their renormalisation involves cancellations between purely bosonic and fermionic interactions. Here, I will show how perturbative unitarity constraints can be used to derive renormalised matching conditions for generic theories. These general results comprise the matching conditions for specific models that address current flavour anomalies and can be used for phenomenological analyses for rare and CP violating kaon decays.